Re: [RFC PATCH 40/56] x86/alternative: Use sync_core_nmi_safe()

Peter Zijlstra
2025-10-16T18:58:33Z

On Thu, Oct 16, 2025 at 06:56:41PM +0000, Kaplan, David wrote:

> > About faster, no. But MFENCE has the benefit of not causing VMEXITs and
> > also not being IRET, so I'm not opposed to you using that as an AMD
> > version of SERIALIZE for the time being.
>
> Ok. Btw, how long has Intel supported SERIALIZE?

I'm not sure.. its fairly new, so

> Do we even need a 'mov-cr2' version of sync_core or could we say that
> dynamic mitigations requires a CPU capable of either a serializing
> MFENCE or SERIALIZE.

don't think we can get away with that, alas.